Sheet-metal pipe.



B. D. FUDGE.

SHEET METAL PIPE.

APPLIOATION FILED JAN. 2, 1913.

1,061,739. Patented May13,1913.

H may be readily interlocked by an unskilled BENJAMIN DAVID FUDGE, OFIBAINBRIDGE, GEORGIA.

Specification 01' Letters Patent.

SHEET-METAL PIPE.

Application filed January 2, 1913. Serial No. 739,840.

to stove pipes and has for one of. its objects the provision of a pipesection which may be conveniently nested with similar sections for thepurpose of making a.more compact arrangement for transportation.

A further object of the invention is to provide a pipe section the edgesof which person and when so interlocked form a pipe which is generallysimilar to the pipe sections commonly used and in which it is impossibleto disengage the interlocked edges without unbending the same.

Other objects and the features of novelty will be apparent from thefollowing description taken in connection with the accompanying,drawings of which- Figure 1 is'an elevationof a pipe section embodyingmy invention, the interlocking edges of the section being disengaged andslightly separated; Fig. 2 is a transverse section on the line2-2 ofFig. 1; Fig. 3 is a transverse section on the line 33 of Fig. 1; Fig. 4is a transverse section on the line 4-4 of Fig. 1; Fig. 5 is aperspective view showing the pipe section in the position where theedges are about to be interlocked; Fig. 6 is a perspective view of thepipe section with the edges interlocked and before the edges have beenmoved relatively in a longitudinal direction for the purpose ofcompleting the pipe; Fig. 7 is an elevatlon of the completed pipe; andFig. 8 is an enlarged detail section on line 8-8 of Fig. 7.

Referring to the drawings it will be ob served that the pipe consists ofthe usual rolled up sheet 10 having at one end the .usualcircumferential head 11 and the longitudinal crimps 12. As shown inFigs. 1 to 4, one edge of the sheet 10 is turned back upon itself toform the hook or flange 13, the free edge of which is inclined orwedgeshaped longitudinally of the pipe so that the hook at the line 2-2is much shorter than at the lines 3-3 or 4-41 The opposite longitudinaledge of the sheet is doubled as shown wat 14 in Figs. 2, 3 and 4 and thedoubled edge is turned back upon itself to form the hook or flange 15which is adapted to be interlocked with the hook 13. The free edge ofthe hook 15 is inclined or wedge-shaped longitudinally of the pipe andoppositely with respect to the inclined edge of thehook- 13 so that thehook is considerably longer on the line 22 of Fig. 1 than on the lines3'3 and 4-4. The single edge 16 of the doubled portion of the sheetis'turned back upon the doubled portion as shown in Figs. 2,3 and 4 andso arranged with respect to the book 15 as to provide a space 17slightly narrower than the hook 13 so that when the latter is forcedthrough this 's' ace into interlocking engagement with t e hook 15 theend 16 will be sprung inwardly to a slight extent and when the hooks arein interlockin relation the end 16 will assume its norma position andprevent the edges of the sheet from being sep-' arated. It will also beobserved that the bend 18 forms a stop for the hook 13 in the operationof interlocking the hooks. The end 16 also overlies the interlockedbooks on the interior of the Itwill be observed from Figs. 2, 3 and 4that the'hook 13 is slightly longer at each of the lines 2-2, 33, and4.4, than the space between the end ofthe hook 15 and the bend 18 sothat when the pipe is completed, as shown in Fig. 7, the hooks cannot bedis- Patented May 13, 1913. y

pipe and thus provides a smooth interior finish.

engaged without being moved relatively endwise so as to bring the hook13 to a position where this space is wider. In assembling the pipesection it is therefore necessary to move the edges relatively endwiseto a position where the space between the end of the hook 15 and thebend 18 will permit the insertion of the hook 13. For this purpose asuitable indicating mark 19 may e provided on the pipe and the end 20 ofthe hook 13 brought into registration with this mark, as shown in Fig.5. The edges of the pipe sections are then forced together as shown inFig. 6, in which position the hooks 13 and 15 are interlocked, and thenmoved relatively endwise to the position shown in Fig. 7, which comletes the pipe.

As will be rea ily understood from the foregoing description, theinterlocked edges cannotbe separated after they have been once pressedtogether, to the position shown in Fig. 6, without bend1ngthe end 16back to a position permitting the hooks to be disengaged, and thereforemy improvedv pipe section when once assembled, is a permanent structurethe same as the ordinary pipe sections which have a closed seam forjoining the longitudinal edges.

Having thus described my invention, what I claim'is:

1. A sheet metal pipe section having on i its longitudinal edgesinterlocking hooks the free longitudinal edges of which are relativelyinclined longitudinally of the pipe, for the'purpose described.

2. A sheet metal pipe section having its longitudinal edges formed withhooks adapted to be interlocked and the free longitudinal edges of whichare reversely inclined longitudinally of the pipe, for the purposedescribed. 1 p

3. A sheet metal pipe section having its longitudinal edges reverselyturned to form hooks adapted to be interlocked, and extendingcontinuously from end to end of the section the free edges of the hooksbeing oppositely inclined longitudinally of the pipe, for the purposedescribed.

4. A sheet metal pipe section having one of its longitudinal edgesturned back upon itself to form a hook and its other longitudinal edgedoubled, saiddoubled edge being turned back upon itself to form a hookadapted to be interlocked with the first mentioned hook, and the singleedge of the doubled portion being turned back on the inside of, the pipetowardsaid first mentioned hook to overlie the hooks when the latter areinterlocked.

5. A sheet metal pipe section having one of its longitudinal edgesturned back upon itself to form a hook which is tapered longitudinallyof the pipe, and its other longitudinal edge doubled and turned backupon itself and tapered oppositely of the first mentioned hook andadapted to be interlocked therewith, and the single edge of the doubledportion being turned back to prevent disengagement of said'hooks.

6. A sheet metal pipe section having .turned oppositely Wedge-shapedinterlocking edges extending from end to end of the section, and meansfor holding the edges in interlocked relation. v

7. A sheet metal pipe having interlocking longitudinally tapering-hookson its longitudinal edges, and means preventing disengagement of saidhooks by a collapsing force applied to the pipe.

In testimony whereof I aflix'my slgnature in presence of two witnesses.

BENJAMIN DAVID runes. Witnesses:

J. A. WATsoN, l B. M. KENT.

